Combined thrust mechanism for singlebucket power shovel



Jan. 25, 1966 s. REBROV ETAL COMBINED THRUST MECHANISM FOR SINGLE-BUCKET POWER SHOVEL Filed Nov. 4, 1963 INVENTORS 8 3% WW? m an m s u EM? W 22 A Ad I M a w United States Patent 3,231 115 CQMBINED THRUST MECHANISM FOR SINGLE- BUCKET POWER SHQVEL Alexei Sergeevieh Rehrov, Sergei Mikhailovich Borisov, Vadim Stanislavovich Semashko, and Isaak Lvovieh Duhinsky, all of Moscow, U.S.S.R., assignors to Vsesouzny Nauchno-Issledovatelsky Institute Stroitelnogo i Dorozhnogo Mashinostroeniia Filed Nov. 4, 1963, Ser. No. 321,104 Claims. (Cl. 214-135) The present invention relates broadly to the excavating art and more particularly, to a power shovel of the type in which the thrusting or shifting of the dipper handle is effected by cables or ropes actuated from the main shovel frame.

The invention still more particularly relates to a combined rope thrusting mechanism for a single bucket power shovel.

Several kinds of rope-thrusting mechanisms are known, which at present are used with power shovels. These mechanisms consist of an independent and a dependent section that create the thrust effort.

In one of the alternatives the dependent section creates the thrust force on the handle carrying the bucket towards the heading automatically by means of the hoisting rope, one end of which is secured to the drum of the main winch and the second end-to an additional drum located either on the shipper shaft or at the pivot of the boom. The independent section creates a thrust force on the handle carrying the bucket by means of ropes or a chain from the pressure drum driven by the main winch.

Another known arrangement includes a structure that embodies a thrust mechanism of a more simple design, in which the dependent section of the thrust force is created, without the use of such an additional drum, by securing the second end of the hoisting rope to the end of the handle (thrust mechanism system used by the American concern Northwest Engineering Company).

The independent section of the Northwest thrust mechanism creates a thrust force with the aid of the pressure drum of the main winch and a double rope sheave block at the end of the handle. Investigations have shown that the thrust force created by the dependent section of the Northwest mechanism is insufiicient for automatic movement ahead or crowding of the handle when excavating soil; therefore it proves necessary to simultaneously actuate the independent section of the mechanism, this making operation of the power shovel more complicated.

The invention claimed is aimed at creating a combined thrust mechanism for a single-bucket universal power shovel that will be able to create an increased thrust force in its dependent section ensuring the required automatic moving-out or crowding of the handle during excavation. A result of this invention is simplification of the power shovel control and increase in output which will follow the reduction in power losses and better bucket filling.

To attain this aim the thrust mechanism of the invention and of the type described above, i.e. a combined thrust mechanism and rope arrangement consisting of a dependent and an independent section, is characterized in that the hoisting rope forms a pressure pulley block, encompassing the pressure sheave secured on the shipper shaft of the boom, the sheave secured on the dipper handle, the second pressure sheave on the boom, and with its end fastened to the boom.

It is preferable that the hoisting rope when wound from the hoisting drum to the head sheave of the boom should pass around a deflecting sheave secured to the boom and be secured to the boom after forming the pressure pulley block, above the location of the pressure sheaves. It is also preferable that the sheave on the handle be secured on a hinge to create an efiicient ratio of the bucket hoisting and thrust forces and speeds for various positions of the handle.

For better explanation of the invention its description is given below with reference to the drawings appended, of which FIG. 1 is a diagrammatic view of the proposed rope-thrust arrangement and FIG. 2 is a fragmentary view partly in section and partly in elevation illustrating the hinged mounting for the sheave at the end of the handle remote from the bucket.

The proposed thrust mechanism comprises in its independent section a main winch W, onto pressure drum 1 of which there are secured ropes 2 and 3 wound-on in opposite directions, passing over deflecting sheaves 4- and 5 on the pivot axis of boom 6 mounted on frame F, as well as first pair of pressure sheaves 7 and '70 mounted for independent rotation on shipper shaft S, and secured separately to the ends of handle 8 as at 22 and 33 respectively.

The handle 8 passes through the saddle block 20 and is supported for reciprocating movement by the pressure sheaves '7 and '70.

In its dependent (automatic) section the thrust mechanism comprises hoisting rope cable 9, one end of which is secured to hoisting drum 10 of the main winch. This hoisting rope passes consecutively over deflecting sheave 11, head sheave 12, padded sheave 13 on the bucket, head sheave 14, pressure sheave 15 on the boom, sheave 16 on handle 8 at the end thereof remote from the bucket, pressure sheave 17 on the boom, and has its second end secured to boom 6 above pressure sheaves 1S and 17 as at 99 and thus, above the axis of shipper shaft S which carries pressure sheaves 15 and 17.

As can be seen from FIG. 1, hoisting rope 9, passing around pressure sheave 15, sheave 16 on the handle, pressure sheave 17 and being secured on boom 6, forms a pressure pulley block that during operation creates a thrust force on the handle carrying the bucket B. With such an arrangement of the rope that ensures not only hoisting of the bucket but also its being pressed or crowded against the heading there will be no necessity of using the independent section of the thrust mechanism during excavation except for increased thrust, as a result of which power shovel control will be simplified.

To ensure that the thrust force created by this pressure pulley block always has its maximum value when the dipper handle and the bucket occupy various positions dur ing excavation, sheave 16 is hinged to handle 8 with the aid of a pivotor axle 18, as shown in FIG. 2. Sheave 16 is located in the pivot of the handle and can swivel in respect to axle 18 Within the limits of the jaw of this ivot. p Among other advantages of the claimed thrust mechanism there should be noted simplification in design due to the absence of an additional pressure drum on the shipper shaft or pivot, which is employed in many of the existing pressure mechanisms.

What we claim is:

i. In a power shovel, a frame, a supporting boom, a pivot means mounting one end of the boom on the frame, a shipper shaft intermediate the ends of the boom and extending transversely thereof, a dipper handle carried by the boom and movable with respect to the boom and shipper shaft during a digging operation, a bucket carried at one end of the handle, a main winch having two drums, a combined thrust mechanism for said handle comprising an independent section and a dependent section, said independent section including a first pair of sheaves mounted on the boom at the pivot thereof, a first pair of pressure sheaves mounted on said shipper shaft, a pair of ropes having one end secured to and Wound on one of said drums respectively in opposite directions, each passing over one of said first-mentioned sheaves at the pivot of the boom and one of said firstmentioned pressure sheaves in opposite directions respectively with respect to the latter sheaves and having their other ends respectively secured adjacent opposite ends of the handle, and said dependent section of the thrust mechanism including the other of said drums, a hoisting rope, a pair of sheaves mounted at the other end of the boom on an axis parallel to the pivot axis, a paddock sheave on the bucket and mounted at right angles to the last-mentioned axis, a second pair of pressure sheaves carried by the shipper shaft, a sheave mounted at the end of the handle remote from the bucket for rotation about an axis at an angle to the longitudinal axis of the handle and said hoisting rope having one end secured to the second drum wound thereon and passing consecutively around one of said sheaves at the other end of the boom, said paddock sheave, the other sheave at the other end of the boom, one of the sheaves of said second pair of pressure sheaves, said sheave at the end of the handle remote from the bucket, the other one of said sheaves of said second pair of pressure sheaves and then, to a point of securement on the boom.

2. In a power shovel as claimed in claim 1 and an additional and deflecting sheave secured to the boom and over which the hoisting rope runs in passing from its associated drum to the sheave at the other end of the boom.

3 In a power shovel as claimed in claim 1 in which the sheave at the end of the handle remote from the bucket is hingedly mounted to swing about an axis at right angles to the longitudinal axis of the handle.

4. In a power shovelas claimed in claim 3 in which the axis of the hinge is located in a plane above the plane containing the upper surface of the handle whereby the associated shovel will turn about an axis incline with respect to the longitudinal axis of the handle.

5. In a power shovel as claimed in claim 1 in which that one of the first-mentioned pair of ropes whose other end is secured to the end handle remote from the bucket is wound on its associated drum in the same direction as the hoisting rope is wound on its associated drum.

References Cited by the Examiner UNITED STATES PATENTS 1,496,976 6/1924 Burke. 1,529,395 3/1925 Burke. 1,564,791 12/1925 Hoar. 2,420,990 5/ 1947 White.

HUGO O. SCHULZ, Primary Examiner. 

1. IN A POWER SHOVEL, A FRAME, A SUPPORTING BOOM, A PIVOT MEANS MOUNTING ONE END OF THE BOOM ON THE FRAME, A SHIPPER INTERMEDIATE THE ENDS OF THE BOOM AND EXTENDING TRANSVERSEDLY THEREOF, A DIPPER HANDLE CARRIED BY THE BOOM AND MOVABLE WITH RESPECT TO THE BOOM AND SHIPPER SHAFT DURING A DIGGING OPERATION, A BUCKET CARRIED AT ONE END OF THE HANDLE, A MAIN WINCH HAVING TWO DRUMS, A COMBINED THRUST MECHANISM FOR SAID HANDLE COMPRISING AN INDEPENDENT SECTION AND A DEPENDENT SECTION, SAID INDEPENDENT SECTION INCLUDING A FIRST PAIR OF SHEAVES MOUNTED ON THE BOOM AT THE PIVOT THEREOF, A FIRST PAIR OF PRESSURE SHEAVES MOUNTED ON SAID SHIPPER SHAFT, A PAIR OF ROPES HAVING ONE END SECURED TO AND WOUND ON ONE OF SAID DRUMS RESPECTIVELY IN OPPOSITE DIRECTIONS, EACH PASSING OVER ONE OF SAID FIRST-MENTIONED SHEAVES AT THE PIVOT OF THE BOOM AND ONE OF SAID FIRSTMENTIONED PRESSURE SHEAVES IN OPPOSITE DIRECTION RESPECTIVELY WITH RESPECT TO THE LATTER SHEAVES AND HAVING THEIR OTHER ENDS RESPECTIVELY SECURED ADJACENT OPPOSITE ENDS OF THE HANDLE, AND SAID DEPENDENT SECTION OF THE THRUST MECHANISM INCLUDING THE OTHER OF SAID DRUMS, A HOISTING ROPE, A PAIR OF SHEAVES MOUNTED AT THE OTHER END OF THE BOOM ON AN AXIS PARALLEL TO THE PIVOT AXIS, A PADDOCK SHEAVE ON THE BUCKET AND MOUNTED AT RIGHT ANGLES TO THE LAST-MENTIONED AXIS, A SECOND PAIR OF PRESSURE SHEAVES CARRIED BY THE SHIPPER SHAFT, A SHEAVE MOUNTED AT THE END OF THE HANDLE REMOTE FROM THE BUCKET FOR ROTATION ABOUT AN AXIS AT AN ANGLE TO THE LONGITUDINAL AXIS OF THE HANDLE AND SAID HOISTING ROPE HAVING ONE END SECURED TO THE SECOND DRUM WOUND THEREON AND PASSING CONSECUTIVELY AROUND ONE OF SAID SHEAVES AT THE OTHER END OF THE BOOM, SAID PADDOCK SHEAVE, THE OTHER SHEAVE AT THE OTHER END OF THE BOOM, ONE OF THE SHEAVES OF SAID SECOND PAIR OF PRESSURE SHEAVES, SAID SHEAVE AT THE END OF THE HANDLE REMOTE FROM THE BUCKET, THE OTHER ONE OF SAID SHEAVES OF SAID SECOND PAIR OF PRESSURE SHEAVES AND THEN, TO A POINT OF SECUREMENT ON THE BOOM. 